"The Yellow Emperor's Neijing" cloud: "Yin is formed, yang is turned into gas", and if Yang is insufficient, there will be many diseases. Yang Qi is essential for the human body, it is the foundation of our physical health and vital movement. Therefore, guarding yang energy is guarding health, and these ten things that damage yang energy and dissipate yang energy should be done as little as possible!
Source: Chinese Traditional Chinese Medicine